Some time ago I read a well done report on javascript caching, packing, minifying performance. I don't have the link at hand, but googling should dig it (here is a post on the jQuery blog on the same subject). The conclusion was that packing is counter productive overall because the network load saved ONCE by downloading a packed JS file is wasted by unpacking it, probably SEVERAL times. Minify policy got best benchmark (with jsmin free utility).
So I'm sticking to this policy.
Sadly enough WYMeditor does not run from minified file. I sometime run in such case on mu own files, most of the tim it is related to regular expression literals. It seems to be the case here.
Before starting to try clean it, I post her to ask if someone already sorted this out.
If not I'll post my own result, latter on.